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25ef049d60log: mempool: log removal reason in validation interface (James O'Beirne) Pull request description: Currently the exact reason a transaction is removed from the mempool isn't logged. It is sometimes detectable from context, but adding the `reason` to the validation interface logs (where it is already passed) seems like an easy way to disambiguate. For example in the case of mempool expiry, the logs look like this: ``` [validationinterface.cpp:220] [TransactionRemovedFromMempool] [validation] Enqueuing TransactionRemovedFromMempool: txid=<txid> wtxid=<wtxid> [txmempool.cpp:1050] [RemoveUnbroadcastTx] [mempool] Removed <txid> from set of unbroadcast txns before confirmation that txn was sent out [validationinterface.cpp:220] [operator()] [validation] TransactionRemovedFromMempool: txid=<txid> wtxid=<wtxid> [validation.cpp:267] [LimitMempoolSize] [mempool] Expired 1 transactions from the memory pool ``` There is no context-free way to know $txid was evicted on the basis of expiry. This change will make that case (and probably others) clear. ACKs for top commit: 0xB10C: ACK25ef049d60Tree-SHA512: 9890f9fa16f66c8a9296798d8c28993e1b81da17cf592946f2abc22041f0b30b0911ab86a0c48d4aa46b9a8b3f7f5de67778649ac48c97740b0a09aa6816e0af